Avidemux Forum

This topic has been moved to Avidemux-German.

https://avidemux.org/smif/index.php?topic=20793.0

Whenever I open up Avidemux, I want all audio tracks to be disabled when input a video and the default output format to be MP4. How do I do that?

Hallo ich bin neu hier und habe eine Frage zu Advidemux.
ich arbeite schon seit vielen Jahren mit dem Programm allerdings mache ich nur Copys um nicht so große Dateien zu bekommen und bin sehr damit zufrieden.
Jetz aber habe ich ein Problem!
Mir wured in Nvidia vorgeschlagen m,eine Videoaufzeichnungen mit AV1 zu machen aber das funktioniert leider nicht.Ich habe nur einen schwarzen Schirm .
Ich habe auch schon das neue Update 2.8 installiert aber auch damit geht es nicht.

What you're seeing is normal HEVC→AVC behavior in Avidemux 2.7.1 on 32-bit: HEVC is far more efficient so filesize will often shrink unless you force CFR, disable auto framerate detection, and use 2-pass AVC encoding (bitrate is always an average, never exact), and the <15 fps jitter means the source is VFR which Avidemux mishandles unless explicitly converted to CFR.

Quote from: eumagga0x2a on December 17, 2025, 05:16:47 PM

Quote from: Faiakes on December 17, 2025, 04:07:05 PMI go this and a crash from, I suspect, a malformed video file.

This is entirely possible as the size of a compressed frame is supplied by the demuxer used to load the specific file. If the size calculated by the demuxer doesn't fit into the allocated buffer, we safely call it quit.

It might be interesting to analyze the presumably malformed file to understand whether we should have rejected opening it in the first place, but, in general, a safe termination of the application is likely to be the second most sensible way to deal with such an issue.

Well, idiot me I deleted the file but I think I can find it again.
Would you want me to?
(It was an old foreign language film. I have found a different version, so I don't need anything per se)

Quote from: Faiakes on December 17, 2025, 04:07:05 PMI go this and a crash from, I suspect, a malformed video file.

This is entirely possible as the size of a compressed frame is supplied by the demuxer used to load the specific file. If the size calculated by the demuxer doesn't fit into the allocated buffer, we safely call it quit.

It might be interesting to analyze the presumably malformed file to understand whether we should have rejected opening it in the first place, but, in general, a safe termination of the application is likely to be the second most sensible way to deal with such an issue.

Hi

I go this and a crash from, I suspect, a malformed video file.

Thanks for the minimize option...

I really don't know why I didn't even consider running it in a Virtual Desktop... I'm getting old, my brain is worn out.

Thanks for script option and the obvious (for most) the Virtual Desktop option.
Cheers

You can try re-muxing the file with mkvtoolnix.

Note that this is re-muxing, not re-encoding, the process should be very quick, as in seconds or maybe a minute or two.

You can even change the framerate to 25.000 fps, 24.000 fps, whatever you want.

Load your file, then select the default duration of 24000/1001, which equals 23.976 fps, the audio will remain unchanged.

If the resulting re-muxed file is of a different length or the audio becomes de-synced, further investigation would be required.

https://mkvtoolnix.org/

I dunno if this helps, or if it is still relevant some 8 years later(?), but, if you have a video that is in 25fps, the only option is to re-encode at 23.98, AND modify the audio filter to resample the audio "From PAL to FILM". This will keep the sync, but it will also extend the video a little and may sound "slower" - but in my experience with anything encoded in 25 fps, that is not the proper pitch for the audio anyway, and if you have a sharp ear, you can tell anything in 25 fps sounds a little "chipmunky" when compared to a proper 24 fps file.

Anyway, by the sounds of it, you have a perfectly good 23.98 fps video, but the audio tracks are somehow encoded to be in sync with a 25 fps speed, making them OUT of sync with your video, correct?

If so, try half of what I suggested, and COPY your video (as MKV or MP4) as you would, but use the AUDIO FILTER to change audio from "PAL to FILM"  and hopefully that will sync everything up without having to re-encode the video.

Alternatively, if you want to speed up the video to match 25fps audio, then you're looking at re-encoding the video.
I dunno why you would want to speed it up anyway? That "chipmunk" pitch is annoying and ruins a good movie.

I also recommend making sure the sample rate is set to 48 kHz (48000 Hz), if it isn't already, as I have had horrible results with 44kHz after copying/converting. 44kHz is great for audio music (CD) tracks, but not movie audio.